On-line inquiry under a small-system operating system
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TL;DR
An option to a small operating system that permits interruptions of a job, execution of a program to handle an inquiry, and return to the interrupted job is discussed.
Abstract
The original purpose of the DPS inquiry support-to provide a function that allows inquiries to disk files during stacked-job processing-was surpassed. The DPS inquiry function more generally offers the possibility of starting almost any type of high-priority program during stacked-job processing without aborting the current job in the job stack. This function is offered in a small system with reasonable safeguards to protect the user against mistakes.